First Generation 1965 1966 1967 1968 1969 1970 1971 1972 1973 Second Generation 1974 1975 1976 1977 1978 Third Generation 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 Fourth Generation 1994 1995 1996 1997 1998